linux-kernel - [PATCH 3.10 238/319] mISDN: Support DR6 indication in mISDNipac driver

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Date:   Sun,  5 Feb 2017 20:21:00 +0100
From:   Willy Tarreau <w@....eu>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org,
        linux@...ck-us.net
Cc:     "Maciej S. Szmigiero" <mail@...iej.szmigiero.name>,
        "David S . Miller" <davem@...emloft.net>, Willy Tarreau <w@....eu>
Subject: [PATCH 3.10 238/319] mISDN: Support DR6 indication in mISDNipac driver

From: "Maciej S. Szmigiero" <mail@...iej.szmigiero.name>

commit 1e1589ad8b5cb5b8a6781ba5850cf710ada0e919 upstream.

According to figure 39 in PEB3086 data sheet, version 1.4 this indication
replaces DR when layer 1 transition source state is F6.

This fixes mISDN layer 1 getting stuck in F6 state in TE mode on
Dialogic Diva 2.02 card (and possibly others) when NT deactivates it.

Signed-off-by: Maciej S. Szmigiero <mail@...iej.szmigiero.name>
Acked-by: Karsten Keil <keil@...systems.de>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Willy Tarreau <w@....eu>
---
 drivers/isdn/hardware/mISDN/ipac.h      | 1 +
 drivers/isdn/hardware/mISDN/mISDNipac.c | 2 ++
 2 files changed, 3 insertions(+)

diff --git a/drivers/isdn/hardware/mISDN/ipac.h b/drivers/isdn/hardware/mISDN/ipac.h
index 8121e04..31fb3b0 100644
--- a/drivers/isdn/hardware/mISDN/ipac.h
+++ b/drivers/isdn/hardware/mISDN/ipac.h
@@ -217,6 +217,7 @@ struct ipac_hw {
 #define ISAC_IND_DR		0x0
 #define ISAC_IND_SD		0x2
 #define ISAC_IND_DIS		0x3
+#define ISAC_IND_DR6		0x5
 #define ISAC_IND_EI		0x6
 #define ISAC_IND_RSY		0x4
 #define ISAC_IND_ARD		0x8
diff --git a/drivers/isdn/hardware/mISDN/mISDNipac.c b/drivers/isdn/hardware/mISDN/mISDNipac.c
index ccd7d85..bac920c 100644
--- a/drivers/isdn/hardware/mISDN/mISDNipac.c
+++ b/drivers/isdn/hardware/mISDN/mISDNipac.c
@@ -80,6 +80,7 @@ isac_ph_state_bh(struct dchannel *dch)
 		l1_event(dch->l1, HW_DEACT_CNF);
 		break;
 	case ISAC_IND_DR:
+	case ISAC_IND_DR6:
 		dch->state = 3;
 		l1_event(dch->l1, HW_DEACT_IND);
 		break;
@@ -660,6 +661,7 @@ isac_l1cmd(struct dchannel *dch, u32 cmd)
 		spin_lock_irqsave(isac->hwlock, flags);
 		if ((isac->state == ISAC_IND_EI) ||
 		    (isac->state == ISAC_IND_DR) ||
+		    (isac->state == ISAC_IND_DR6) ||
 		    (isac->state == ISAC_IND_RS))
 			ph_command(isac, ISAC_CMD_TIM);
 		else
-- 
2.8.0.rc2.1.gbe9624a